Arc generator



R. HERZOG ARQ GENERATOR July 19, 1927. 1,636,094

Filed Dec. 28. 19 25 Patented July 19, 1927.

.UNITED STATES ROBERT nrmzoe, or BERLIN, GERMANY,

nssrenon To 0. LORENZ AKTIENGESELL- SCHAFT, F BERLIN-TEMBELHOF, GERMANY.

ARC GENERATOR.

Application filed December 2 8, 1925, Serial No.- 77,985, and in Germany February 13, 1925.

The present invention relates to theuse of electric arcs for generating high frequency oscillations in the employment of which a method is known as disclosed, for

example, in my U. S. Patent 1,503,324 having for its object to obtain a uniform burning of the electric arc, and employing in combination with the oscillatory arc circuit and with the arc, a circuit which does not 10 oscillate independently, situated on the highfrequency side of the are between the arc and the oscillatory arc circuit, a large selfinductance being included in this circuit and a second self-inductance being coupled with the first self-inductance in such a manner that theeffect of the first self-inductance upon the oscillatory arc circuit is entirely or substantially neutralized.

There exist, however, as a rule, disturbances superimposed on the arc-light oscillations originating from particles ofcarbon crumbling off or burned out in the arc and.

causing interference in receivin sets established in the neighborhood of the transmitter, especially when capacities are connected in parallel with the are for the purpose of further stabilizing it and increasing its efficiency.

According to the present invention these disturbances are eliminated by shunting a part of the large self-inductance by a capacity. It has been found suitable to connect this capacity in parallel with that part of the self-inductance across which the oscillatorycircuit is connected, and according to a further feature of the invention the natural frequency of this capacity together with the portion of the self-inductance in parallel with it is made to correspond with that of the circuit in which the disturbances exist, i. e., the frequency of the circuit formed by the arc, its parallel capacity and the leads to the latter. The accompanying drawing shows diagrammatically an arc generator embodying the invention.

In the arrangement as shown an intermediate circuit is interposed between the arc and the antenna-ground or radiation circuit. A self-inductance L, of comparatively large size is connected in series with the electric arc B, another self-inductance L, being connected in parallel to the self-inductance L, and the arc. C and C are blocking condensers preventing continuous,

current supplied at the terminals of the are from flowing into the oscillatory arc circuit. C is a capacity shunting the arc and serving as a stabilizing means, as is well known'in the art. With regard to all currents which flow parallel through these selfinductances L, and L, the total selfin-- ductance is reduced to a very small figure. With regard to all currents which pass through the two self-inductances in series, however, the sum of these self-inductances isa factor which must be considered and controlled. The oscillatory arc circuit is constituted by an inductance coil L in series with the capacity C The effect of the con nection of the elements as set forth is that while the arc is shunted by a-very high self-inductance L plus L for securing a uniform burning of the are, this self-in ductance in the case of series currents is by properly choosing or intimately coupling the two self-inductances L," and L, reduced to a verysmall figure with respct to or as compared with the currents generated by the L an oscillatory control circuit which does not oscillate independently of. and whose natural frequency corresponds approxin ately to the value of the natural frequency of the oscillatory arc circuit consisting of the arc, the self-inducatance L and the stabilizing condenser C in parallel therewith, and the associated leads. This latter frequency generally corresponds to the frequency of the disturbing wave. I

The arrangement and the tuning of the capacity 0 need not necesari'ly be carried out exactly in the above described manner, but this has been found to be the most eflicient means of attaining the desired end.

What I. claim is: 1. In an arc generator, an oscillatory circuit tuned to the frequency of the oscillations to be produced and with the arc, a shunt circuit which does not oscillate'indellO pendently oi the oscillatory circuit, said shunt circuit being situated on the high-frequency side of said are between the arc and said oscillatory circuit, a selfdnductance included in said shunt circuit, a second selfinductance coupled with said first selfinductancc in such a manner that the effect ol said first selihinductance upon the oscillatory circuit is entirely or substantially neutralized, and a capacity connected across said first salt-inductance.

.2. hi an arc generator, an oscillatorycircurt tuned to the :lrcqueucy oi the oscillations to be produced and with the are, a shunt circuit which does not oscillate independently oi the oscillatory circuit, said shunt circuit being situated on the high-frequency side of said are between the arc and said oscillatory circuit, a sclf-intluctance included in said shunt circuit, a second sel'rinductance connected in parallel with said first selfiinductance and saidarc in such a manner that the eti'ectof said tirst self-hr ductance upon theoscillatory circuit is entirely or substantially neutralized, and a eapacityconnected across said first self-inductance. I V

3. In an arc generator, an oscillatory circuit tuned to the frequency of the oiacilla tions to he produced and. with the are, a sluintcircuit which does not oscillate indeifiendently of the oscillation circuit, said shunt circuit being: situated on the high-l re quency side of l are between the arc and said oscillatory circuit, a seli'-in ductance'ineluded in said shunt circuit, a second sel'tinductance coupled with said first self-ind uctauce in such a manner that the effect oil said firs Scl'iiliicltlCiuntf upon the oscillatory circuit is entirely or substantially neutralized, a stabilizing; capacity shunting the are, and a capacity in said shunt circuit and round-ted arr said first self-inductance and eii'ective to give said shunt circuit a natural frequency ahoiiit equal to that torined by the arc, the said capacity sauntinp; the same and the associated leads.

l. in an arc generator, an oscillatory circuil tuned to the frequency ol the oscillations to he produced and with the are, a shunt circuit which does not oscillate independently of the oscillatory circuit, said shunt circuit being; situated on the high-frequency side of said are between the arc and said oscillatory circuit, self-inductance included in said shunt circuit, a second self-inductance connected in parallel with said first selt-inductance and said are in such a manner that theaeffect of said first self-inductance upon the oscillatory circuit is entirely or substantially neutralized, a stabilizing, capacity shunting the arc, and a capacity in said shunt circuit and connected across said first sclf-inductance and effective to give said shunt circuit a natural frequency about equal to that termed by the ar:, the and capacity shunting the same and the associated leads. V

In an arc generator, an oscillatory circuit tuned to the :t'requency oi the oscillations to be produced and with the arc, ashunt circuit which does not oscillate independently of the oscillatory circuit, said shunt circuit being situated on the high-frequency side of said are between the arc and said oscillatory circuit, a sel'liinductance included in said shunt circuit, a second self-inductance coupled with said first self-inductance in such a manner that the effect of said first self-inductance upon the oscillatory circuit is entirely or substantially neutralized, a capacity connected across said first self-inductance, and means to impart the oscillationsproduced in said oscillatory circuit to an antenna circuit.

In an arc generator, an oscillatory circuit tuned to the frequency of the oscillations to he produced and with the are, a shunt circuit which does not oscillate iudeiendently of the oscillatory circuit, said shunt circuit being situated on the high-fre quency side of said are between the arc and said oscillatory circuit, a seli inductance ineluded in said shunt circuit, asccond self inductance connected in parallel with said first self-inductance and said arc in such a manner that the elect of said first se i"- inductance upon the oscillatory circuit is entirely or suhstauiiallyv neutralized. a capacity connected across said first self-inductaure, and means: to impart'the oscillations produced in said oscillatory circuit to an antenna circuit.

In testimony whereof I have aiiixed my signature. ROBERT HERZOG. 

